No Slide Title · 2005. 4. 19. · Possible Stereo Analyst. ADS40 - system components OI40 Operator...
Transcript of No Slide Title · 2005. 4. 19. · Possible Stereo Analyst. ADS40 - system components OI40 Operator...
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Government Technologies Division©2003 Cooper Aerial Surveys Co.
Technologies Division
Aerial Mapping SystemsAerial Photogrammetry
David Major
GIS Group April 19, 2005
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History of Photogrammetry
1038 Camera obscura
1727 Silver salts
1782 Montgolfier Brothers
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History of Photogammetry
1903 Wright Brothers control mobility
1913 first aerial maps
Photogrammetry was born
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Types of Photogrammetry
Aerial Photography
Terrestrial Photography
Close Range Photography
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Radiant Waves
Visibel Light•Blue
•Green
•Red
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Structure of Aerial Film Panchromatic
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Structure of Aerial Film Color
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Film Processing
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Drift
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Grab and Tilt
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Overview of Photogrammetry
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Focal LengthFlying Height
Relief Displacement
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Overview of Photogrammetry30% Sidelap & 60% overlap
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Overview of Photogrammetry
Stereo Plotters
• Analytical • Analog• Softcopy
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Photogrammetry Products
DTM• Grid• Breaklines• Contours, 90% ½ contour
(NMAS)
• Spot Elevation, 90% ¼ contour (NMAS)
Planimetrics
Orthorectified Imagery
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Overview of LiDAR
LiDAR - Light Detection and Ranging
• Push Broom Laser Scan• 25000 pts/sec
Airborne GPS• 5-10 cm – Reality 15 cm
IMU - Inertial Measurement Unit
• 1 degree• 1/3000th flying height 1’-2’
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Overview of LiDAR
Filtering
Multiple Returns
• Buildings
• Vegetation
• Bare Earth
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QA/QC
Quality Control• At least 3 Ground Stations
– Within 10 km• Some ground control
Quality Assurance• Should have spot check• Should have cross section checks
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Aerial vs. LiDAR
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LiDAR ProductPros• 20% the cost of
photogrammetry• Deliveries in as little as 30
days• Minimal Ground Control
Cons• No Planimetrics • 10-20 times more data• May contain anomalies• No minor break detail• Not a smooth surface
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Government Technologies Division©2003 Cooper Aerial Surveys Co.
Technologies Division
ADS40 Airborne Digital Sensor
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ADS40 Airborne Digital Sensor
Key Factors in choosing ADS40:
Fast Workflow
Better Resolution
Better Color Quality
Possible Multi-spectral
Possible Stereo Analyst
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ADS40 - system components
OI40Operator Interface
SH40Sensor Head
MM40Mass Memory
DO64DigitalOptics
CU40Control Unit
PAV30
IMU integrated in Sensor Head SH40GPS integrated in Control Unit CU40FCMS Flight Control Management System (software)POS Position and Attitude computer integrated in CU40PAV30 gyro-stabilized mount with attitude control from POS
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Airborne ADS40 system
GPS satellites
GPS ground reference station
ADS40 system
1
2
34 5
6
ADS40 System
1 Sensor head SH40 with:- Digital optics DO64 - IMU
2 Control unit CU40 with:- position & attitudecomputer POS
3 Mass Memory MM404 Operator interface OI405 Guidance Indicator GI406 Mount PAV30
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ADS40 color composite - Adria, Italy
Date: 20 June 2001
Flying height:1,500 m / 4,900 ft
Ground sample distance:GSD ≈ 15 cm / 1/2 ft
Flight direction:
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High area coverage performance (FoV, swath)
High resolution and accuracy (spatial and radiometric)
Affordable, application oriented sensors
Multispectral imagery
Linear sensor characteristics
Stereo capability
Direct digital workflow
Main features of the ADS40
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Government Technologies Division©2003 Cooper Aerial Surveys Co.
Technologies Division
Principle of pushbroom scanner ADS40Differences to film frame camera RC30
and surface array technology
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Airborne digital sensor ADS40
Analog aerial cameraRC30
Terminology
Swath 2.4 km
Pixel on CCD 6.5 x 6.5 μm
Pixel on ground 20x20cm
Ground sample distance, GSD 20 cm
Image size 228 mm x 228 mm
Example
Footprint
2.4 km x 2.4 km
Focal length 153 mm
Photo scale 1 : 10,500
Field of view diagonal 90°
Example
Field of view across trackFoV 64°
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Three-line pushbroom scanner
composed of backward view lines
composed of nadir view lines
composed of forward view lines
Backward scene Nadir scene Forward scene
Backward
Nadir
Forward
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Different imaging concepts of ADS40 and RC30
overlapping aerial photographs
discrete perspective images
forward view
nadir view
backward view
continuous pushbroom scanning
Airborne digital sensor ADS40
Analog aerial cameraRC30
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Airborne digital sensor ADS40
Analog aerial cameraRC30
Image overlap
All objects recorded 3 times
Flying with 60% overlap only 50% of all objects are on 3 photographs
Not all objects recorded 3 times
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Airborne digital sensor ADS40
Analog aerial cameraRC30
Photograph with central perspective
Flight line with overlapping photographs
Effect of central perspective
Forward view strip
Nadir view strip
Backward view strip
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Panchromatic and spectral band filters
Panchromatic backwards NIR band Panchromatic nadirBlue band Green band Red band Panchromatic forward
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ADS40 panchromatic lines - Adria, Italy
Forward Nadir
Backward
Date: 20 June 2001
Flying height:1,500 m / 4,900 ft
Ground sample distance:GSD ≈ 15 cm / 1/2 ft
Flight direction:
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ADS40 Nadir panchromatic line - Adria, Italy
Date: 20 June 2001
Flying height:1,500 m / 4,900 ft
Ground sample distance:GSD ≈ 15 cm / 1/2 ft
Flight direction:
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ADS40 spectral channels - Adria, Italy
Blue 430 - 490 nm Green 535 - 585 nm
Red 610 - 660 nm Infra-red 835 - 885 nm
Date: 20 June 2001
Flying height:1,500 m / 4,900 ft
Ground sample distance:GSD ≈ 15 cm / 1/2 ft
Flight direction:
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ADS40 color composite - Adria, Italy
Date: 20 June 2001
Flying height:1,500 m / 4,900 ft
Ground sample distance:GSD ≈ 15 cm / 1/2 ft
Flight direction:
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ADS40 false color composite - Adria, Italy
Date: 20 June 2001
Flying height:1,500 m / 4,900 ft
Ground sample distance:GSD ≈ 15 cm / 1/2 ft
Flight direction:
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Interference filtersUsed in ADS40
Absorption filtersUsed in CCD array cameras
Overlapping bands
Filter transmission characteristics
Only interference filters are suitable for remote sensing applications where response in non-overlapping narrow bands is evaluated
Non-overlapping narrow bands
nm nm
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Spectral band filters
1
5
6
3
4
2
7
Legend
1 Grass
2 Lime Stone
3 Sand, dry
4 Snow, old
5 Fir tree
6 Asphalt, wet
7 Water
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Dynamic range - data normalization
Dynamic range 8 bit
Dynamic range of CCD chain of ADS40: 12 bit = 4096 steps
8 steps
16 steps
32 steps
64 steps
256 steps
ResolutionLimit of
human eyes
Resolutionsteps
OffsetDynamic range of normalized data: 8 bit = 256 steps
Offset, normalized data and look-up table applied during data normalization are used to restore original data of 12 bit dynamic range
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0
5000
10000
15000
0 1000 2000 3000
0
5000
10000
15000
0 1000 2000 3000
Radiometry
Flying height 9,840 ft/ 3,000 mGSD ≈ 25 cmReichstag, Berlin 23 April 1999
Detail in high reflectance area
Detail in low reflectance area
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Government Technologies Division©2003 Cooper Aerial Surveys Co.
Technologies Division
ADS40 Project WorkflowDiffering from
frame camera technology
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Filmprocessingin darkroom
FCIR
Color
B&W
Stereo plotter
Films used alternatively
All spectral channels simultaneously
GIS
DTM
Orthophotos
Mapping
Revision
Visualization
Image analysis
ClassificationDigitalwork-station
Groundprocessing
Film based workflow RC30
Direct digital workflow ADS40
PrinterColor MSB&W
Archivesystem
Color FCIRB&WDSW500scanner
Film
Mass Memory
Workflow - film based and direct digital
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Digital data flow of ground processing
DigitalworkstationGround
Processing
of ADS40 data
Printer
Archivesystem
Mass Memory
DTMOrthophotosMappingRevisionVisualizationImage analysisClassification
GIS
Level 0 - Raw dataconsisting of : Geometric raw images (TIFF and other formats) and processed orientation data
Level 1- Rectified dataconsisting of : Fully corrected stereo-viewable panchromatic images and fully corrected multispectral images
Level 2 -Geo-coded data consisting of:
Panchromatic and multispectral orthophotos
Level 0 Level 1
Level 2
Spectral channels simultaneously
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-6-3036
0
RollPitchYaw
Rectification of Images from Level 0 to Level 1
Original Scene( without gyro stabilization)
Rectified Scene
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ADS40 image - Verona, Italy ~ 1:35,000
Date: 20 June 2001
Flying height:1,500 m / 4,900 ft
Ground sample distance:GSD ≈ 15 cm / 1/2 ft
Flight direction:
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ADS40 image - Verona, Italy ~ 1:17,500
Date: 20 June 2001
Flying height:1,500 m / 4,900 ft
Ground sample distance:GSD ≈ 15 cm / 1/2 ft
Flight direction:
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ADS40 image - Verona, Italy ~ 1:8,500
Date: 20 June 2001
Flying height:1,500 m / 4,900 ft
Ground sample distance:GSD ≈ 15 cm / 1/2 ft
Flight direction:
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ADS40 image - Verona, Italy ~ 1:4,500
Date: 20 June 2001
Flying height:1,500 m / 4,900 ft
Ground sample distance:GSD ≈ 15 cm / 1/2 ft
Flight direction:
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ADS40 image - Verona, Italy ~ 1:2,500
Date: 20 June 2001
Flying height:1,500 m / 4,900 ft
Ground sample distance:GSD ≈ 15 cm / 1/2 ft
Flight direction:
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ADS40 image - Verona, Italy ~ 1:1,250
Date: 20 June 2001
Flying height:1,500 m / 4,900 ft
Ground sample distance:GSD ≈ 15 cm / 1/2 ft
Flight direction:
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ADS40 image - Verona, Italy ~ 1:625
Date: 20 June 2001
Flying height:1,500 m / 4,900 ft
Ground sample distance:GSD ≈ 15 cm / 1/2 ft
Flight direction:
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ADS40 image - Sion, Switzerland
Date:17 April 2001
Flyingheight:1,500 m4,900 ft
Groundsampledistance:GSD ≈ 15 cmGSD ≈ 1/2 ft
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Government Technologies Division©2003 Cooper Aerial Surveys Co.
Technologies Division
Imagery
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Summary of ADS40 abilitiesPros
• Digital Capabilities• Efficient Digital Workflow• Multi-spectral Capabilities• Photogrammetry• LiDAR integration
Cons• New developing technology• Limited to 15 cm or 6”
resolution• Minimum Acquisition cost